The invention relates to a COB type LED light gathering TIR lens
system and a designing method thereof. The COB type LED light gathering TIR lens
system and the designing method thereof are used in a multi-COB type LED
light source to achieve the light gathering type light emitting effect. An optical
system is mainly composed of a COB type LED
light source and a free-form surface TIR lens, and is used for carrying out angle dividing control over the light emitted by the COB type LED
light source. The optical system is designed based on the
point light source approximation theory, the free-form surface discrete point of the TIR lens is calculated according to the iteration method, the user-defined collimation function suitable for the area source is compiled according to the
macro language in the TracePro, the
accent lighting of high evenness and
chromaticity of the light area can be achieved by automatically adjusting original discrete point coordinates, the light gathering type light emitting effect is achieved, and the defects caused when an TIR lens designed in an original
point light source system is directly applied to a COB type LED are overcome. Meanwhile, the Fresnel variant structure is applied to the outer surface of the top of an optimized lens, the thickness of the lens is reduced, cost is saved, and the lighting effect is improved.